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Difference in Expansion Between the Front and Back Sides Derived from Board Warping

Author: darknExecutions: 2385
TOP/Shared Formulas (Engineering)/Civil & Mechanical

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When a board is warped, calculate the difference in expansion and contraction between its front and back surfaces.
Warp: d
mmor m
Thickness: t
mmor m
Target length: L
mmor m
Significant digits
≤ 6
Expansion-Contraction Difference mmor m [This is the difference in stretch between the front and back.]
Warpage Rate %Relative to 1000 mm
While the warpage rate is generally expressed as the percentage of [warpage amount] / [reference length], here we use
the “warpage rate per 1000 mm” as specified in JIS K 6911.

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